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United States Patent | 5,313,142 |
Wong | May 17, 1994 |
A compact fluorescent lamp in combination with a high frequency DC-AC converter includes a rectifier circuit and a buffer capacitor coupled between a source of low frequency AC voltage and the converter. A feedback capacitor couples a high frequency feedback signal corresponding to the converter output signal to the buffer capacitor via the rectifier circuit so as to improve the power factor of the combination.
Inventors: | Wong; John M. (Buffalo Grove, IL) |
Assignee: | North American Philips Corporation (New York, NY) |
Appl. No.: | 001940 |
Filed: | January 8, 1993 |
Current U.S. Class: | 315/205; 315/209R; 315/226; 315/244; 315/247; 315/DIG.5; 363/37; 363/131 |
Intern'l Class: | H05B 041/29 |
Field of Search: | 315/209 R,226,227 R,244,246,247,283,200 R,205 363/37,131 |
4935672 | Jun., 1990 | Lammers et al. | 315/200. |
5050057 | Sep., 1991 | Notohara et al. | 363/37. |
5057749 | Oct., 1991 | Nilssen | 315/247. |
5059867 | Oct., 1991 | Nerone et al. | 315/247. |